Her tribe-mates said she was annoying and whining, she was called a bitch by the southern gentleman, but she went out with a bang on day 27 of season 18. Sierra gave a bit of what-now to ever-truthful and ever-courageous Ben Wade right before her final tribal council. She seemed to be a fierce competitor during the challenges and didn't back down from any confrontation; this possibly made her a threat to the other six.
What she did win, though, was popularity.
When asked “Who would you like to least see win the game?”, “Who’s most likely to stab you in the back?” and “Who would squander the million-dollar prize the quickest?”, the contestant consensus each time was Sierra.